<?xml version="1.0" encoding="US-ASCII"?>
<!-- Generated by CompSci Transform (tm) - http://www.compsciresources.com -->
<!-- Created: Wed Apr 16 02:47:58 UTC 2025 -->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <loc xlink:type="locator" xlink:label="mcb_AdjustedNetIncomeLoss" xlink:href="mcb-20241231.xsd#mcb_AdjustedNetIncomeLoss"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_AdjustedNetIncomeLoss_lbl" xml:lang="en-US">Adjusted Net Income (Loss)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_AdjustedNetIncomeLoss" xlink:to="mcb_AdjustedNetIncomeLoss_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_AdjustedNetIncomeLoss_lbl0" xml:lang="en-US">The portion of profit or loss for the period, adjusted net of income taxes, which is attributable to the parent.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_AdjustedNetIncomeLoss" xlink:to="mcb_AdjustedNetIncomeLoss_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_AdjustedNetIncomeLossFromContinuingOperationsBeforeIncomeTaxesNoncontrollingInterest" xlink:href="mcb-20241231.xsd#mcb_AdjustedNetIncomeLossFromContinuingOperationsBeforeIncomeTaxesNoncontrollingInterest"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_AdjustedNetIncomeLossFromContinuingOperationsBeforeIncomeTaxesNoncontrollingInterest_lbl" xml:lang="en-US">Adjusted Net Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_AdjustedNetIncomeLossFromContinuingOperationsBeforeIncomeTaxesNoncontrollingInterest" xlink:to="mcb_AdjustedNetIncomeLossFromContinuingOperationsBeforeIncomeTaxesNoncontrollingInterest_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_AdjustedNetIncomeLossFromContinuingOperationsBeforeIncomeTaxesNoncontrollingInterest_lbl0" xml:lang="en-US">Amount of adjusted income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_AdjustedNetIncomeLossFromContinuingOperationsBeforeIncomeTaxesNoncontrollingInterest" xlink:to="mcb_AdjustedNetIncomeLossFromContinuingOperationsBeforeIncomeTaxesNoncontrollingInterest_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_AdjustedReturnOnAverageTangibleCommonEquity" xlink:href="mcb-20241231.xsd#mcb_AdjustedReturnOnAverageTangibleCommonEquity"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_AdjustedReturnOnAverageTangibleCommonEquity_lbl" xml:lang="en-US">Adjusted Return on Average Tangible Common Equity</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_AdjustedReturnOnAverageTangibleCommonEquity" xlink:to="mcb_AdjustedReturnOnAverageTangibleCommonEquity_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_AdjustedReturnOnAverageTangibleCommonEquity_lbl0" xml:lang="en-US">The percentage of adjusted return on average tangible common equity.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_AdjustedReturnOnAverageTangibleCommonEquity" xlink:to="mcb_AdjustedReturnOnAverageTangibleCommonEquity_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_AverageCommonEquity" xlink:href="mcb-20241231.xsd#mcb_AverageCommonEquity"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_AverageCommonEquity_lbl" xml:lang="en-US">Average Common Equity</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_AverageCommonEquity" xlink:to="mcb_AverageCommonEquity_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_AverageCommonEquity_lbl0" xml:lang="en-US">The amount of average common equity as on specific date.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_AverageCommonEquity" xlink:to="mcb_AverageCommonEquity_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_AverageIntangibleAssets" xlink:href="mcb-20241231.xsd#mcb_AverageIntangibleAssets"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_AverageIntangibleAssets_lbl" xml:lang="en-US">Average Intangible Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_AverageIntangibleAssets" xlink:to="mcb_AverageIntangibleAssets_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_AverageIntangibleAssets_lbl0" xml:lang="en-US">The amount of average intangible assets as on specific date.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_AverageIntangibleAssets" xlink:to="mcb_AverageIntangibleAssets_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_AverageTangibleCommonEquity" xlink:href="mcb-20241231.xsd#mcb_AverageTangibleCommonEquity"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_AverageTangibleCommonEquity_lbl" xml:lang="en-US">Average Tangible Common Equity</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_AverageTangibleCommonEquity" xlink:to="mcb_AverageTangibleCommonEquity_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_AverageTangibleCommonEquity_lbl0" xml:lang="en-US">The amount of average tangible common equity as on specific date.AC</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_AverageTangibleCommonEquity" xlink:to="mcb_AverageTangibleCommonEquity_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_DeclineInGPGRevenue" xlink:href="mcb-20241231.xsd#mcb_DeclineInGPGRevenue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_DeclineInGPGRevenue_lbl" xml:lang="en-US">Decline in GPG Revenue</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_DeclineInGPGRevenue" xlink:to="mcb_DeclineInGPGRevenue_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_DeclineInGPGRevenue_lbl0" xml:lang="en-US">The amount of decrease in income due to decline in GPG revenue.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_DeclineInGPGRevenue" xlink:to="mcb_DeclineInGPGRevenue_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_DigitalTransformationExpenses" xlink:href="mcb-20241231.xsd#mcb_DigitalTransformationExpenses"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_DigitalTransformationExpenses_lbl" xml:lang="en-US">Digital Transformation expenses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_DigitalTransformationExpenses" xlink:to="mcb_DigitalTransformationExpenses_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_DigitalTransformationExpenses_lbl0" xml:lang="en-US">Represent Digital Transformation expenses.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_DigitalTransformationExpenses" xlink:to="mcb_DigitalTransformationExpenses_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_GPGCyptoRevenue" xlink:href="mcb-20241231.xsd#mcb_GPGCyptoRevenue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_GPGCyptoRevenue_lbl" xml:lang="en-US">GPG Cypto Revenue</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_GPGCyptoRevenue" xlink:to="mcb_GPGCyptoRevenue_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_GPGCyptoRevenue_lbl0" xml:lang="en-US">Represent GPG Cypto Revenue</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_GPGCyptoRevenue" xlink:to="mcb_GPGCyptoRevenue_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_GPGWindDown" xlink:href="mcb-20241231.xsd#mcb_GPGWindDown"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_GPGWindDown_lbl" xml:lang="en-US">GPG wind down</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_GPGWindDown" xlink:to="mcb_GPGWindDown_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_GPGWindDown_lbl0" xml:lang="en-US">Represent GPG wind down</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_GPGWindDown" xlink:to="mcb_GPGWindDown_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_GlobalPaymentsGroupCryptoRevenue" xlink:href="mcb-20241231.xsd#mcb_GlobalPaymentsGroupCryptoRevenue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_GlobalPaymentsGroupCryptoRevenue_lbl" xml:lang="en-US">Global Payments Group Crypto Revenue</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_GlobalPaymentsGroupCryptoRevenue" xlink:to="mcb_GlobalPaymentsGroupCryptoRevenue_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_GlobalPaymentsGroupCryptoRevenue_lbl0" xml:lang="en-US">Global Payments Group Crypto Revenue</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_GlobalPaymentsGroupCryptoRevenue" xlink:to="mcb_GlobalPaymentsGroupCryptoRevenue_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_GlobalPaymentsGroupWindDown" xlink:href="mcb-20241231.xsd#mcb_GlobalPaymentsGroupWindDown"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_GlobalPaymentsGroupWindDown_lbl" xml:lang="en-US">Global Payments Group Wind Down</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_GlobalPaymentsGroupWindDown" xlink:to="mcb_GlobalPaymentsGroupWindDown_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_GlobalPaymentsGroupWindDown_lbl0" xml:lang="en-US">Global Payments Group wind down</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_GlobalPaymentsGroupWindDown" xlink:to="mcb_GlobalPaymentsGroupWindDown_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_IncreaseInCostOfFundsRelatedToCryptoDepositOutflows" xlink:href="mcb-20241231.xsd#mcb_IncreaseInCostOfFundsRelatedToCryptoDepositOutflows"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_IncreaseInCostOfFundsRelatedToCryptoDepositOutflows_lbl" xml:lang="en-US">Increase in Cost of Funds Related to Crypto Deposit Outflows</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_IncreaseInCostOfFundsRelatedToCryptoDepositOutflows" xlink:to="mcb_IncreaseInCostOfFundsRelatedToCryptoDepositOutflows_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_IncreaseInCostOfFundsRelatedToCryptoDepositOutflows_lbl0" xml:lang="en-US">The amount of decrease in income related to cost of funds related to crypto deposit outflows.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_IncreaseInCostOfFundsRelatedToCryptoDepositOutflows" xlink:to="mcb_IncreaseInCostOfFundsRelatedToCryptoDepositOutflows_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_IncreasedOperatingExpenses" xlink:href="mcb-20241231.xsd#mcb_IncreasedOperatingExpenses"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_IncreasedOperatingExpenses_lbl" xml:lang="en-US">Increased Operating Expenses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_IncreasedOperatingExpenses" xlink:to="mcb_IncreasedOperatingExpenses_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_IncreasedOperatingExpenses_lbl0" xml:lang="en-US">The amount of decrease in income due to increased operating expenses.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_IncreasedOperatingExpenses" xlink:to="mcb_IncreasedOperatingExpenses_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_PartialReversalOfRegulatorySettlementReserve" xlink:href="mcb-20241231.xsd#mcb_PartialReversalOfRegulatorySettlementReserve"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_PartialReversalOfRegulatorySettlementReserve_lbl" xml:lang="en-US">Partial Reversal of Regulatory Settlement Reserve</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_PartialReversalOfRegulatorySettlementReserve" xlink:to="mcb_PartialReversalOfRegulatorySettlementReserve_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_PartialReversalOfRegulatorySettlementReserve_lbl0" xml:lang="en-US">The amount of increase in income due to partial reversal of regulatory settlement reserve.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_PartialReversalOfRegulatorySettlementReserve" xlink:to="mcb_PartialReversalOfRegulatorySettlementReserve_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_RegulatoryRemediationExpenses" xlink:href="mcb-20241231.xsd#mcb_RegulatoryRemediationExpenses"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_RegulatoryRemediationExpenses_lbl" xml:lang="en-US">Regulatory Remediation expenses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_RegulatoryRemediationExpenses" xlink:to="mcb_RegulatoryRemediationExpenses_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_RegulatoryRemediationExpenses_lbl0" xml:lang="en-US">Represent Regulatory remediation expenses.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_RegulatoryRemediationExpenses" xlink:to="mcb_RegulatoryRemediationExpenses_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_YearoverYearIncreaseDecreaseInAdjustedNetIncome" xlink:href="mcb-20241231.xsd#mcb_YearoverYearIncreaseDecreaseInAdjustedNetIncome"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_YearoverYearIncreaseDecreaseInAdjustedNetIncome_lbl" xml:lang="en-US">Year-over-Year Increase (Decrease) in Adjusted Net Income</label>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_YearoverYearIncreaseDecreaseInAdjustedNetIncome" xlink:to="mcb_YearoverYearIncreaseDecreaseInAdjustedNetIncome_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_YearoverYearIncreaseDecreaseInAdjustedNetIncome_lbl0" xml:lang="en-US">Represent year-over-year increase (decrease) in adjusted net income.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_YearoverYearIncreaseDecreaseInAdjustedNetIncome" xlink:to="mcb_YearoverYearIncreaseDecreaseInAdjustedNetIncome_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_EquityAwardsAdjustmentsAdjustmentsForEquityAwardsFailedToMeetPerformanceConditionsMember" xlink:href="mcb-20241231.xsd#mcb_EquityAwardsAdjustmentsAdjustmentsForEquityAwardsFailedToMeetPerformanceConditionsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_EquityAwardsAdjustmentsAdjustmentsForEquityAwardsFailedToMeetPerformanceConditionsMember_lbl" xml:lang="en-US">Adjustments For Equity Awards Failed To Meet Performance Conditions [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_EquityAwardsAdjustmentsAdjustmentsForEquityAwardsFailedToMeetPerformanceConditionsMember" xlink:to="mcb_EquityAwardsAdjustmentsAdjustmentsForEquityAwardsFailedToMeetPerformanceConditionsMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_EquityAwardsAdjustmentsAdjustmentsForEquityAwardsFailedToMeetPerformanceConditionsMember_lbl0" xml:lang="en-US">This member presents the equity awards adjustments on adjustments for equity awards that failed to meet performance conditions.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_EquityAwardsAdjustmentsAdjustmentsForEquityAwardsFailedToMeetPerformanceConditionsMember" xlink:to="mcb_EquityAwardsAdjustmentsAdjustmentsForEquityAwardsFailedToMeetPerformanceConditionsMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfCurrentAwardsVestedDuringCurrentYearMember" xlink:href="mcb-20241231.xsd#mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfCurrentAwardsVestedDuringCurrentYearMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfCurrentAwardsVestedDuringCurrentYearMember_lbl" xml:lang="en-US">Change In Fair Value As Of Vesting Date Of Current Year Awards Vested During Current Year [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfCurrentAwardsVestedDuringCurrentYearMember" xlink:to="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfCurrentAwardsVestedDuringCurrentYearMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfCurrentAwardsVestedDuringCurrentYearMember_lbl0" xml:lang="en-US">This member presents the equity awards adjustments on the change in fair value (as of vesting date) of current  year awards vested during current year.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfCurrentAwardsVestedDuringCurrentYearMember" xlink:to="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfCurrentAwardsVestedDuringCurrentYearMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfPriorYearAwardsVestedDuringCurrentYearMember" xlink:href="mcb-20241231.xsd#mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfPriorYearAwardsVestedDuringCurrentYearMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfPriorYearAwardsVestedDuringCurrentYearMember_lbl" xml:lang="en-US">Change In Fair Value As Of Vesting Date Of Prior Year Awards Vested During Current Year [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfPriorYearAwardsVestedDuringCurrentYearMember" xlink:to="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfPriorYearAwardsVestedDuringCurrentYearMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfPriorYearAwardsVestedDuringCurrentYearMember_lbl0" xml:lang="en-US">This member presents the equity awards adjustments on the change in fair value (as of vesting date) of prior year awards vested during current year.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfPriorYearAwardsVestedDuringCurrentYearMember" xlink:to="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfPriorYearAwardsVestedDuringCurrentYearMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfVestedAwardsDuringCurrentYearMember" xlink:href="mcb-20241231.xsd#mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfVestedAwardsDuringCurrentYearMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfVestedAwardsDuringCurrentYearMember_lbl" xml:lang="en-US">Change In Fair Value As Of Vesting Date Of Awards Vested During Current Year [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfVestedAwardsDuringCurrentYearMember" xlink:to="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfVestedAwardsDuringCurrentYearMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfVestedAwardsDuringCurrentYearMember_lbl0" xml:lang="en-US">This member presents the equity awards adjustments on the change in fair value (as of vesting date) of awards vested during current year.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfVestedAwardsDuringCurrentYearMember" xlink:to="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfVestedAwardsDuringCurrentYearMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfYearEndOfOutstandingAndUnvestedAwardsGrantedInPriorYearsMember" xlink:href="mcb-20241231.xsd#mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfYearEndOfOutstandingAndUnvestedAwardsGrantedInPriorYearsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfYearEndOfOutstandingAndUnvestedAwardsGrantedInPriorYearsMember_lbl" xml:lang="en-US">Change In Fair Value Of Outstanding And Unvested Awards Granted In Prior Fiscal Years [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfYearEndOfOutstandingAndUnvestedAwardsGrantedInPriorYearsMember" xlink:to="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfYearEndOfOutstandingAndUnvestedAwardsGrantedInPriorYearsMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfYearEndOfOutstandingAndUnvestedAwardsGrantedInPriorYearsMember_lbl0" xml:lang="en-US">This member presents the equity awards adjustments on the change in fair value from the end of the prior fiscal year of any awards granted in prior years that are outstanding and unvested as of the end of the applicable year.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfYearEndOfOutstandingAndUnvestedAwardsGrantedInPriorYearsMember" xlink:to="mcb_EquityAwardsAdjustmentsChangeInFairValueAsOfYearEndOfOutstandingAndUnvestedAwardsGrantedInPriorYearsMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_EquityAwardsAdjustmentsDividendsOrOtherEarningsPaidOnEquityAwardsNotOtherwiseReflectedInFairValueMember" xlink:href="mcb-20241231.xsd#mcb_EquityAwardsAdjustmentsDividendsOrOtherEarningsPaidOnEquityAwardsNotOtherwiseReflectedInFairValueMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_EquityAwardsAdjustmentsDividendsOrOtherEarningsPaidOnEquityAwardsNotOtherwiseReflectedInFairValueMember_lbl" xml:lang="en-US">Dividends Or Other Earnings Paid On Equity Awards Not Otherwise Reflected In Fair Value [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_EquityAwardsAdjustmentsDividendsOrOtherEarningsPaidOnEquityAwardsNotOtherwiseReflectedInFairValueMember" xlink:to="mcb_EquityAwardsAdjustmentsDividendsOrOtherEarningsPaidOnEquityAwardsNotOtherwiseReflectedInFairValueMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_EquityAwardsAdjustmentsDividendsOrOtherEarningsPaidOnEquityAwardsNotOtherwiseReflectedInFairValueMember_lbl0" xml:lang="en-US">This member presents the equity awards adjustments on dividends or other earnings paid on equity awards not otherwise reflected in fair value.</label>
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    <loc xlink:type="locator" xlink:label="mcb_EquityAwardsAdjustmentsFairValueOfEquityAwardsGrantedInPriorYearsForfeitedInTheCoveredYearMember" xlink:href="mcb-20241231.xsd#mcb_EquityAwardsAdjustmentsFairValueOfEquityAwardsGrantedInPriorYearsForfeitedInTheCoveredYearMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_EquityAwardsAdjustmentsFairValueOfEquityAwardsGrantedInPriorYearsForfeitedInTheCoveredYearMember_lbl" xml:lang="en-US">Fair Value of Equity Awards Granted in Prior Years Forfeited in the Covered Year [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_EquityAwardsAdjustmentsFairValueOfEquityAwardsGrantedInPriorYearsForfeitedInTheCoveredYearMember" xlink:to="mcb_EquityAwardsAdjustmentsFairValueOfEquityAwardsGrantedInPriorYearsForfeitedInTheCoveredYearMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_EquityAwardsAdjustmentsFairValueOfEquityAwardsGrantedInPriorYearsForfeitedInTheCoveredYearMember_lbl0" xml:lang="en-US">This member presents the equity awards adjustments on fair value of equity awards granted in prior years forfeited in the covered year.</label>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_EquityAwardsAdjustmentsMember" xlink:to="mcb_EquityAwardsAdjustmentsMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_EquityAwardsAdjustmentsMember_lbl0" xml:lang="en-US">This member presents the equity awards adjustments on the year-end fair value of any equity awards granted in the applicable year that are outstanding and unvested as of the end of the year.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_EquityAwardsAdjustmentsMember" xlink:to="mcb_EquityAwardsAdjustmentsMember_lbl0"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_EquityAwardsAdjustmentsYearEndFairValueOfAwardsGrantedInCurrentYearMember_lbl" xml:lang="en-US">Year-end Fair Value Of Awards Granted In The Current Fiscal Year [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_EquityAwardsAdjustmentsYearEndFairValueOfAwardsGrantedInCurrentYearMember" xlink:to="mcb_EquityAwardsAdjustmentsYearEndFairValueOfAwardsGrantedInCurrentYearMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_EquityAwardsAdjustmentsYearEndFairValueOfAwardsGrantedInCurrentYearMember_lbl0" xml:lang="en-US">This member presents the equity awards adjustments on the year-end fair value of any equity awards granted in the applicable year that are outstanding and unvested as of the end of the year.</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_EquityAwardsValueInCompensationTableForTheApplicableYearMember_lbl" xml:lang="en-US">Equity Awards Value In Summary Compensation Table (Grant Date Value)</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_EquityAwardsValueInCompensationTableForTheApplicableYearMember_lbl0" xml:lang="en-US">This member presents the adjustment (deduction) for equity awards value from summary compensation table.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_EquityAwardsValueInCompensationTableForTheApplicableYearMember" xlink:to="mcb_EquityAwardsValueInCompensationTableForTheApplicableYearMember_lbl0"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_NetAdjustmentsForEquityAwardsMember" xlink:to="mcb_NetAdjustmentsForEquityAwardsMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_NetAdjustmentsForEquityAwardsMember_lbl0" xml:lang="en-US">This member presents the net compensation adjustment for equity awards, which is comprised of equity awards value from summary compensation table, net of total equity awards adjustments.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_NetAdjustmentsForEquityAwardsMember" xlink:to="mcb_NetAdjustmentsForEquityAwardsMember_lbl0"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_NetAdjustmentsForPensionMember_lbl" xml:lang="en-US">Total Net Adjustments For Pension [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_NetAdjustmentsForPensionMember" xlink:to="mcb_NetAdjustmentsForPensionMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_NetAdjustmentsForPensionMember_lbl0" xml:lang="en-US">This member presents the net compensation adjustment for pension, which is comprised of pension value from summary compensation table, net of total pension adjustments.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_NetAdjustmentsForPensionMember" xlink:to="mcb_NetAdjustmentsForPensionMember_lbl0"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="mcb_PensionAdjustmentsMember_lbl" xml:lang="en-US">Total Pension Adjustments [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_PensionAdjustmentsMember" xlink:to="mcb_PensionAdjustmentsMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_PensionAdjustmentsMember_lbl0" xml:lang="en-US">This member presents the total pension adjustments, which may be comprised of adjustments for service cost and prior service cost.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_PensionAdjustmentsMember" xlink:to="mcb_PensionAdjustmentsMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_PensionAdjustmentsPriorServiceCostMember" xlink:href="mcb-20241231.xsd#mcb_PensionAdjustmentsPriorServiceCostMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="mcb_PensionAdjustmentsPriorServiceCostMember_lbl" xml:lang="en-US">Pension Adjustments Prior Service Cost [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_PensionAdjustmentsPriorServiceCostMember" xlink:to="mcb_PensionAdjustmentsPriorServiceCostMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_PensionAdjustmentsPriorServiceCostMember_lbl0" xml:lang="en-US">This member presents the total pension adjustments, prior service cost.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="mcb_PensionAdjustmentsPriorServiceCostMember" xlink:to="mcb_PensionAdjustmentsPriorServiceCostMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="mcb_PensionAdjustmentsServiceCostMember" xlink:href="mcb-20241231.xsd#mcb_PensionAdjustmentsServiceCostMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="mcb_PensionAdjustmentsServiceCostMember_lbl" xml:lang="en-US">Pension Adjustments Service Cost [Member]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="mcb_PensionAdjustmentsServiceCostMember_lbl0" xml:lang="en-US">This member presents the pension adjustments, service cost.</label>
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    <loc xlink:type="locator" xlink:label="mcb_PensionValueInCompensationTableForTheApplicableYearMember" xlink:href="mcb-20241231.xsd#mcb_PensionValueInCompensationTableForTheApplicableYearMember"/>
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